From your title I thought you were at the scene today of the small plane that landed on a California freeway and was subsequently run into by three cars.
First thing I'd do is see if there was anyone alive to help.
But I wouldn't move them unless they were in imminent danger from fire or explosion.
If there were anyone alive I would imagine there would be bleeding to try and stem.
I'd sure be praying I wasn't there by myself for long.